| Step 1. | Choose Surfacing tab→Surfacing group→Split list→Parting Surface. 
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| Step 2. | Select a planar face or reference plane that is parallel to the direction you want the parting surface. | 
| Step 3. | Select a curve. | 
| Step 4. | Type the surface width you want, then position the cursor in the direction that you want the parting surface and click. | 
| Step 5. | Click Finish. | 
Tip:
The curve you select can be open or closed. When selecting more than one curve, the curves must be end-point connected.